What is the purpose of this screw on my 1991 mercury classic 40hp???
D DareDevilDave Founding Member Founding Member Joined Apr 25, 2015 Posts 154 Likes 47 Points 183 Today at 12:46 PM #1 What is the purpose of this screw on my 1991 mercury classic 40hp???
R Retired-Guy Founding Member Founding Member Joined Oct 5, 2015 Posts 1,150 Likes 271 Points 298 Location Bismarck Today at 1:20 PM #2 Pobably idle speed adjustment.
N NDbowman Founding Member Founding Member Joined Aug 21, 2015 Posts 1,248 Likes 518 Points 313 Today at 3:56 PM #3 I'm not a boat motor guy, but it looks like an idle speed adjustment screw to me also.